You need to give more details on that. Where do we start from to guide you? However, if you look here, there are so many tutorials to choose from.
Choose Filter > Render > Lighting Effects. From the Presets menu at upper left, choose a style. In the preview window, select individual lights you want to adjust. Then, in the upper half of the Properties panel, do any of the following: Choose a light type (Spot, Infinite, or Point) from the top menu. Adjust color, intensity, and hotspot size. To duplicate a light, Alt-drag (Windows) or Option-drag (Mac OS) the light within the preview window. In the lower half of the Properties panel, adjust the entire set of lights with these options: texture channel.